Without bolting it in a car with a seat attached to it the dimensions could be slightly off, I did sit it in my 87 442, as the seats are not installed in it. It sits right on all 4 corners of the mounts the same as the bucket seat does.
rear outer bolt pattern (to floor) 14.375"
rear bolt pattern (to seat) 14.250"
front bolt pattern (to seat) 14.500"
Mark
rear outer bolt pattern (to floor) 14.375"
rear bolt pattern (to seat) 14.250"
front bolt pattern (to seat) 14.500"
Mark